Loyalists attacked the Rising Sun Bar in Greysteel 3 times, the first in this bomb attack on 10 November 1975
18 year before the worst civilian attack in Derry since Bloody Sunday the bar was bombed by loyalists, along with a pub in Newtownbutler, the bomb at the Rising Sun only partially exploded & seems like it was planted in the toilets. Four months later the bar was bombed again but this time much worse & the nearby Foyle View Bar was also bombed, the second bombing in early February 1976 caused such damage much of the bar had to be rebuilt.
I'm guessing this would have been the work of the UDA rather than the UVF, as the UVF seemed stronger in Armagh, south & east Tyrone & west Down but the UDA had a stronger presence in north & west Derry, both were strong in most of east Antrim (the UDA a little more so) & east Down (the UVF a little more so) but neither were strong in Fermanagh which seen the least tit-for-tat cycles of violence started by either the UDA or UVF.
Would most people agree this would be the work of the UDA? Other than the UVF the only other loyalists groups capable of this were the Red Hand Commando who were a Proxy of the UVF by 1972 anyway, and Down Orange Welfare who's activities were confined to rural Down, although their leader is the only one to have suggested a 32-County Irish Republic believing unionist & Fine Gael votes would out number Fianna Fail, Sinn Fein & Socialist votes.
I noticed Loyalists attacked several places in the 70's that would become famous for massacres in the late 80s/early 90s. Boyles bar in Cappagh was bombed by the Glenanne Gang in 1974, killing one and injuring 4, the Avenue bar that the UVF shot up & killed 3 civilians in & injured 6 in May 88 (first time the vz.58 rifles were used), in 1973 was bombed killing one & bombed again in 76 killing 2, the Sunflower bar was bombed twice in 74 killing , Conway's Bar was bombed 4 years in a row, in 73, 74, 75 76 killing 6 people,etc